Foam regulator is an additive used to improve the processing performance and foam quality of foam materials. The common foaming regulator is PVC foaming regulator, which is an ultra-high molecular weight acrylic copolymer.

(1)Improve melt strength

The formation and stability of bubbles are crucial during the foaming process. Foam regulators can effectively prevent the merging of bubbles by increasing the strength of the melt. High melt strength means that the melt can better maintain its shape and structure during the processing. For foam products, this helps to obtain a more uniform distribution of foam pores after cooling and shaping, thereby improving the compressive strength and impact resistance of the product. During the extrusion or injection molding process of foam materials, insufficient melt strength may lead to melt fracture or uneven flow, resulting in defects such as silver lines and traces of bubble rupture on the surface of the product. The foaming regulator can effectively reduce these processing defects and improve the appearance quality of the product by increasing the melt strength.

（2）Promote plasticization

Foam regulators can promote the plasticization process of materials such as PVC, which means that the processing temperature can be reduced during the manufacturing process. After using foaming regulators, good plasticization can be achieved at lower temperatures, reducing the risk of thermal decomposition and improving product stability and processing safety. And the foaming regulator can make the material more evenly plasticized during the processing. The foaming regulator improves the intermolecular interactions, making the plasticization of the entire melt more uniform, thereby enhancing the overall performance of the product.

（3）Improve fluidity

Foaming regulator can improve the fluidity of the melt, making it easier for the material to flow during processing. When injection molding complex PVC foam products, good fluidity can ensure that the melt can smoothly fill every corner of the mold, reducing defects such as material shortage and shrinkage caused by insufficient flow.

And good fluidity can make the melt flow more evenly in the mold, thereby obtaining better surface quality.

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